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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Sr10Al4Si6O by Materials Project

Sr10Al4Si6O crystallizes in the orthorhombic Immm space group. The structure is three-dimensional. there are five inequivalent Sr sites. In the first Sr site, Sr is bonded in a distorted single-bond geometry to five Si and one O atom. There are four shorter (3.42 Å) and one longer (3.66 Å) Sr–Si bond lengths. The Sr–O bond length is 2.89 Å. In the second Sr site, Sr is bonded in a single-bond geometry to four equivalent Al, four equivalent Si, and one O atom. All Sr–Al bond lengths are 3.44 Å. All Sr–Si bond lengths are 3.44 Å. The Sr–O bond length is 2.50 Å. In the third Sr site, Sr is bonded in a 7-coordinate geometry to two equivalent Al and five Si atoms. Both Sr–Al bond lengths are 3.32 Å. There are a spread of Sr–Si bond distances ranging from 3.24–3.41 Å. In the fourth Sr site, Sr is bonded in a linear geometry to four equivalent Si and two equivalent O atoms. All Sr–Si bond lengths are 3.41 Å. Both Sr–O bond lengths are 2.42 Å. In the fifth Sr site, Sr is bonded to eight equivalent Al and four equivalent Si atoms to form face-sharing SrAl8Si4 cuboctahedra. All Sr–Al bond lengths are 3.46 Å. All Sr–Si bond lengths are 3.62 Å. Al is bonded in a distorted bent 120 degrees geometry to six Sr, one Al, and two Si atoms. The Al–Al bond length is 2.61 Å. There are one shorter (2.47 Å) and one longer (2.52 Å) Al–Si bond lengths. There are two inequivalent Si sites. In the first Si site, Si is bonded in a 9-coordinate geometry to eight Sr and one Al atom. In the second Si site, Si is bonded in a 2-coordinate geometry to seven Sr and two equivalent Al atoms. O is bonded to six Sr atoms to form corner-sharing OSr6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sr13Al6Si8O by Materials Project

Sr13Al6Si8O crystallizes in the monoclinic C2/m space group. The structure is three-dimensional. there are seven inequivalent Sr sites. In the first Sr site, Sr is bonded in a 7-coordinate geometry to two equivalent Al and five Si atoms. Both Sr–Al bond lengths are 3.36 Å. There are a spread of Sr–Si bond distances ranging from 3.29–3.39 Å. In the second Sr site, Sr is bonded in a single-bond geometry to four Al, four Si, and one O atom. There are two shorter (3.42 Å) and two longer (3.44 Å) Sr–Al bond lengths. There are two shorter (3.44 Å) and two longer (3.47 Å) Sr–Si bond lengths. The Sr–O bond length is 2.50 Å. In the third Sr site, Sr is bonded to eight Al and four Si atoms to form a mixture of edge and face-sharing SrAl8Si4 cuboctahedra. There are a spread of Sr–Al bond distances ranging from 3.44–3.48 Å. There are two shorter (3.57 Å) and two longer (3.61 Å) Sr–Si bond lengths. In the fourth Sr site, Sr is bonded in a 7-coordinate geometry to two equivalent Al and five Si atoms. Both Sr–Al bond lengths are 3.31 Å. There are a spread of Sr–Si bond distances ranging from 3.25–3.41 Å. In the fifth Sr site, Sr is bonded in a 7-coordinate geometry to two equivalent Al and five Si atoms. Both Sr–Al bond lengths are 3.29 Å. There are a spread of Sr–Si bond distances ranging from 3.29–3.40 Å. In the sixth Sr site, Sr is bonded in a distorted single-bond geometry to five Si and one O atom. There are four shorter (3.41 Å) and one longer (3.75 Å) Sr–Si bond lengths. The Sr–O bond length is 2.89 Å. In the seventh Sr site, Sr is bonded in a linear geometry to four Si and two equivalent O atoms. There are two shorter (3.41 Å) and two longer (3.42 Å) Sr–Si bond lengths. Both Sr–O bond lengths are 2.42 Å. There are three inequivalent Al sites. In the first Al site, Al is bonded in a 2-coordinate geometry to six Sr, one Al, and two Si atoms. The Al–Al bond length is 2.59 Å. There are one shorter (2.49 Å) and one longer (2.51 Å) Al–Si bond lengths. In the second Al site, Al is bonded in a 2-coordinate geometry to six Sr, one Al, and two Si atoms. The Al–Al bond length is 2.59 Å. There are one shorter (2.50 Å) and one longer (2.53 Å) Al–Si bond lengths. In the third Al site, Al is bonded in a distorted bent 120 degrees geometry to six Sr, one Al, and two Si atoms. There are one shorter (2.48 Å) and one longer (2.51 Å) Al–Si bond lengths. There are four inequivalent Si sites. In the first Si site, Si is bonded in a 2-coordinate geometry to seven Sr and two Al atoms. In the second Si site, Si is bonded in a 2-coordinate geometry to seven Sr and two Al atoms. In the third Si site, Si is bonded in a 9-coordinate geometry to eight Sr and one Al atom. In the fourth Si site, Si is bonded in a 9-coordinate geometry to eight Sr and one Al atom. O is bonded to six Sr atoms to form corner-sharing OSr6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SrAl2(Si2O7)3 by Materials Project

SrAl2Si6O19O2 crystallizes in the monoclinic P2_1/m space group. The structure is three-dimensional and consists of two hydrogen peroxide molecules and one SrAl2Si6O19 framework. In the SrAl2Si6O19 framework, Sr is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of Sr–O bond distances ranging from 2.52–3.19 Å. Al is bonded to four O atoms to form AlO4 tetrahedra that share corners with four SiO4 tetrahedra. There are a spread of Al–O bond distances ranging from 1.72–1.80 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.60–1.65 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent AlO4 tetrahedra and corners with two SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.61–1.65 Å. In the third Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share a cornercorner with one AlO4 tetrahedra and corners with three SiO4 tetrahedra. There are a spread of Si–O bond distances ranging from 1.62–1.66 Å. There are twelve inequivalent O sites. In the first O site, O is bonded in a distorted bent 150 degrees geometry to one Sr, one Al, and one Si atom. In the second O site, O is bonded in a single-bond geometry to one Sr atom. In the third O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fourth O site, O is bonded in a bent 150 degrees geometry to two Si atoms. In the fifth O site, O is bonded in a linear geometry to two equivalent Si atoms. In the sixth O site, O is bonded in a bent 150 degrees geometry to one Sr and two equivalent Si atoms. In the seventh O site, O is bonded in a 3-coordinate geometry to one Sr, one Al, and one Si atom. In the eighth O site, O is bonded in a single-bond geometry to one O atom. The O–O bond length is 1.23 Å. In the ninth O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the tenth O site, O is bonded in a bent 150 degrees geometry to one Sr and one O atom. In the eleventh O site, O is bonded in a bent 150 degrees geometry to one Al and one Si atom. In the twelfth O site, O is bonded in a bent 150 degrees geometry to two Si atoms.

36 MATERIALS SCIENCE↗